Class ChoiceFormat

A ChoiceFormat allows you to attach a format to a range of numbers.
It is generally used in a MessageFormat for handling plurals.
The choice is specified with an ascending list of doubles, where each item
specifies a half-open interval up to the next item:

X matches j if and only if limit[j] <= X < limit[j+1]

If there is no match, then either the first or last index is used, depending
on whether the number (X) is too low or too high. If the limit array is not
in ascending order, the results of formatting will be incorrect. ChoiceFormat
also accepts \u221E as equivalent to infinity(INF).

Note:ChoiceFormat differs from the other Format
classes in that you create a ChoiceFormat object with a
constructor (not with a getInstance style factory
method). The factory methods aren't necessary because ChoiceFormat
doesn't require any complex setup for a given locale. In fact,
ChoiceFormat doesn't implement any locale specific behavior.

When creating a ChoiceFormat, you must specify an array of formats
and an array of limits. The length of these arrays must be the same.
For example,

Format with -INF : is negative
Format with -1.0 : is negative
Format with 0 : is zero or fraction
Format with 0.9 : is zero or fraction
Format with 1.0 : is one
Format with 1.5 : is 1+
Format with 2 : is two
Format with 2.1 : is more than 2.
Format with NaN : is negative
Format with +INF : is more than 2.

toPattern

setChoices

limits - contains the top value that you want
parsed with that format,and should be in ascending sorted order. When
formatting X, the choice will be the i, where
limit[i] <= X < limit[i+1].
If the limit array is not in ascending order, the results of formatting
will be incorrect.

formats - are the formats you want to use for each limit.
They can be either Format objects or Strings.
When formatting with object Y,
if the object is a NumberFormat, then ((NumberFormat) Y).format(X)
is called. Otherwise Y.toString() is called.

getLimits

public double[] getLimits()

Get the limits passed in the constructor.

Returns:

the limits.

getFormats

format

Specialization of format. This method really calls
format(double, StringBuffer, FieldPosition)
thus the range of longs that are supported is only equal to
the range that can be stored by double. This will never be
a practical limitation.

parse

status - an input-output parameter. On input, the
status.index field indicates the first character of the
source text that should be parsed. On exit, if no error
occured, status.index is set to the first unparsed character
in the source text. On exit, if an error did occur,
status.index is unchanged and status.errorIndex is set to the
first index of the character that caused the parse to fail.